The product is a set of 8 used Nalgene 100ml polypropylene volumetric flasks with 6 having screw caps. These flasks are intended for use in microbiological, medical, and biological laboratories. Made in the United States, they are designed for precise and accurate measurements in a laboratory setting. The polypropylene material ensures durability and resistance to chemicals, making them suitable for a variety of laboratory applications. The screw caps provide a secure seal to prevent contamination and evaporation, making them essential pieces of equipment for scientific research and analysis. Free shipping!